net/mac80211/tdls.c

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This source file includes following definitions.
ieee80211_tdls_peer_del_work
ieee80211_tdls_add_ext_capab
ieee80211_tdls_add_subband
ieee80211_tdls_add_supp_channels
ieee80211_tdls_add_oper_classes
ieee80211_tdls_add_bss_coex_ie
ieee80211_get_tdls_sta_capab
ieee80211_tdls_add_link_ie
ieee80211_tdls_add_aid
ieee80211_ac_from_wmm
ieee80211_wmm_aci_aifsn
ieee80211_wmm_ecw
ieee80211_tdls_add_wmm_param_ie
ieee80211_tdls_chandef_vht_upgrade
ieee80211_tdls_add_setup_start_ies
ieee80211_tdls_add_setup_cfm_ies
ieee80211_tdls_add_chan_switch_req_ies
ieee80211_tdls_add_chan_switch_resp_ies
ieee80211_tdls_add_ies
ieee80211_prep_tdls_encap_data
ieee80211_prep_tdls_direct
ieee80211_tdls_build_mgmt_packet_data
ieee80211_tdls_prep_mgmt_packet
ieee80211_tdls_mgmt_setup
ieee80211_tdls_mgmt_teardown
ieee80211_tdls_mgmt
iee80211_tdls_recalc_chanctx
iee80211_tdls_have_ht_peers
iee80211_tdls_recalc_ht_protection
ieee80211_tdls_oper
ieee80211_tdls_oper_request
iee80211_tdls_add_ch_switch_timing
ieee80211_tdls_find_sw_timing_ie
ieee80211_tdls_ch_sw_tmpl_get
ieee80211_tdls_channel_switch
ieee80211_tdls_cancel_channel_switch
ieee80211_tdls_ch_sw_resp_tmpl_get
ieee80211_process_tdls_channel_switch_resp
ieee80211_process_tdls_channel_switch_req
ieee80211_process_tdls_channel_switch
ieee80211_teardown_tdls_peers
ieee80211_tdls_chsw_work
ieee80211_tdls_handle_disconnect
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * mac80211 TDLS handling code
   4  *
   5  * Copyright 2006-2010  Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2014, Intel Corporation
   7  * Copyright 2014  Intel Mobile Communications GmbH
   8  * Copyright 2015 - 2016 Intel Deutschland GmbH
   9  * Copyright (C) 2019 Intel Corporation
  10  */
  11 
  12 #include <linux/ieee80211.h>
  13 #include <linux/log2.h>
  14 #include <net/cfg80211.h>
  15 #include <linux/rtnetlink.h>
  16 #include "ieee80211_i.h"
  17 #include "driver-ops.h"
  18 #include "rate.h"
  19 #include "wme.h"
  20 
  21 /* give usermode some time for retries in setting up the TDLS session */
  22 #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ)
  23 
  24 void ieee80211_tdls_peer_del_work(struct work_struct *wk)
  25 {
  26         struct ieee80211_sub_if_data *sdata;
  27         struct ieee80211_local *local;
  28 
  29         sdata = container_of(wk, struct ieee80211_sub_if_data,
  30                              u.mgd.tdls_peer_del_work.work);
  31         local = sdata->local;
  32 
  33         mutex_lock(&local->mtx);
  34         if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
  35                 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
  36                 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
  37                 eth_zero_addr(sdata->u.mgd.tdls_peer);
  38         }
  39         mutex_unlock(&local->mtx);
  40 }
  41 
  42 static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata,
  43                                          struct sk_buff *skb)
  44 {
  45         struct ieee80211_local *local = sdata->local;
  46         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  47         bool chan_switch = local->hw.wiphy->features &
  48                            NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
  49         bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
  50                           !ifmgd->tdls_wider_bw_prohibited;
  51         bool buffer_sta = ieee80211_hw_check(&local->hw,
  52                                              SUPPORTS_TDLS_BUFFER_STA);
  53         struct ieee80211_supported_band *sband = ieee80211_get_sband(sdata);
  54         bool vht = sband && sband->vht_cap.vht_supported;
  55         u8 *pos = skb_put(skb, 10);
  56 
  57         *pos++ = WLAN_EID_EXT_CAPABILITY;
  58         *pos++ = 8; /* len */
  59         *pos++ = 0x0;
  60         *pos++ = 0x0;
  61         *pos++ = 0x0;
  62         *pos++ = (chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0) |
  63                  (buffer_sta ? WLAN_EXT_CAPA4_TDLS_BUFFER_STA : 0);
  64         *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
  65         *pos++ = 0;
  66         *pos++ = 0;
  67         *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
  68 }
  69 
  70 static u8
  71 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
  72                            struct sk_buff *skb, u16 start, u16 end,
  73                            u16 spacing)
  74 {
  75         u8 subband_cnt = 0, ch_cnt = 0;
  76         struct ieee80211_channel *ch;
  77         struct cfg80211_chan_def chandef;
  78         int i, subband_start;
  79         struct wiphy *wiphy = sdata->local->hw.wiphy;
  80 
  81         for (i = start; i <= end; i += spacing) {
  82                 if (!ch_cnt)
  83                         subband_start = i;
  84 
  85                 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
  86                 if (ch) {
  87                         /* we will be active on the channel */
  88                         cfg80211_chandef_create(&chandef, ch,
  89                                                 NL80211_CHAN_NO_HT);
  90                         if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
  91                                                           sdata->wdev.iftype)) {
  92                                 ch_cnt++;
  93                                 /*
  94                                  * check if the next channel is also part of
  95                                  * this allowed range
  96                                  */
  97                                 continue;
  98                         }
  99                 }
 100 
 101                 /*
 102                  * we've reached the end of a range, with allowed channels
 103                  * found
 104                  */
 105                 if (ch_cnt) {
 106                         u8 *pos = skb_put(skb, 2);
 107                         *pos++ = ieee80211_frequency_to_channel(subband_start);
 108                         *pos++ = ch_cnt;
 109 
 110                         subband_cnt++;
 111                         ch_cnt = 0;
 112                 }
 113         }
 114 
 115         /* all channels in the requested range are allowed - add them here */
 116         if (ch_cnt) {
 117                 u8 *pos = skb_put(skb, 2);
 118                 *pos++ = ieee80211_frequency_to_channel(subband_start);
 119                 *pos++ = ch_cnt;
 120 
 121                 subband_cnt++;
 122         }
 123 
 124         return subband_cnt;
 125 }
 126 
 127 static void
 128 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
 129                                  struct sk_buff *skb)
 130 {
 131         /*
 132          * Add possible channels for TDLS. These are channels that are allowed
 133          * to be active.
 134          */
 135         u8 subband_cnt;
 136         u8 *pos = skb_put(skb, 2);
 137 
 138         *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 139 
 140         /*
 141          * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
 142          * this doesn't happen in real world scenarios.
 143          */
 144 
 145         /* 2GHz, with 5MHz spacing */
 146         subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
 147 
 148         /* 5GHz, with 20MHz spacing */
 149         subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
 150 
 151         /* length */
 152         *pos = 2 * subband_cnt;
 153 }
 154 
 155 static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata,
 156                                             struct sk_buff *skb)
 157 {
 158         u8 *pos;
 159         u8 op_class;
 160 
 161         if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef,
 162                                                   &op_class))
 163                 return;
 164 
 165         pos = skb_put(skb, 4);
 166         *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
 167         *pos++ = 2; /* len */
 168 
 169         *pos++ = op_class;
 170         *pos++ = op_class; /* give current operating class as alternate too */
 171 }
 172 
 173 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
 174 {
 175         u8 *pos = skb_put(skb, 3);
 176 
 177         *pos++ = WLAN_EID_BSS_COEX_2040;
 178         *pos++ = 1; /* len */
 179 
 180         *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
 181 }
 182 
 183 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
 184                                         u16 status_code)
 185 {
 186         struct ieee80211_supported_band *sband;
 187 
 188         /* The capability will be 0 when sending a failure code */
 189         if (status_code != 0)
 190                 return 0;
 191 
 192         sband = ieee80211_get_sband(sdata);
 193         if (sband && sband->band == NL80211_BAND_2GHZ) {
 194                 return WLAN_CAPABILITY_SHORT_SLOT_TIME |
 195                        WLAN_CAPABILITY_SHORT_PREAMBLE;
 196         }
 197 
 198         return 0;
 199 }
 200 
 201 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
 202                                        struct sk_buff *skb, const u8 *peer,
 203                                        bool initiator)
 204 {
 205         struct ieee80211_tdls_lnkie *lnkid;
 206         const u8 *init_addr, *rsp_addr;
 207 
 208         if (initiator) {
 209                 init_addr = sdata->vif.addr;
 210                 rsp_addr = peer;
 211         } else {
 212                 init_addr = peer;
 213                 rsp_addr = sdata->vif.addr;
 214         }
 215 
 216         lnkid = skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
 217 
 218         lnkid->ie_type = WLAN_EID_LINK_ID;
 219         lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
 220 
 221         memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 222         memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
 223         memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
 224 }
 225 
 226 static void
 227 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 228 {
 229         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 230         u8 *pos = skb_put(skb, 4);
 231 
 232         *pos++ = WLAN_EID_AID;
 233         *pos++ = 2; /* len */
 234         put_unaligned_le16(ifmgd->aid, pos);
 235 }
 236 
 237 /* translate numbering in the WMM parameter IE to the mac80211 notation */
 238 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
 239 {
 240         switch (ac) {
 241         default:
 242                 WARN_ON_ONCE(1);
 243                 /* fall through */
 244         case 0:
 245                 return IEEE80211_AC_BE;
 246         case 1:
 247                 return IEEE80211_AC_BK;
 248         case 2:
 249                 return IEEE80211_AC_VI;
 250         case 3:
 251                 return IEEE80211_AC_VO;
 252         }
 253 }
 254 
 255 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
 256 {
 257         u8 ret;
 258 
 259         ret = aifsn & 0x0f;
 260         if (acm)
 261                 ret |= 0x10;
 262         ret |= (aci << 5) & 0x60;
 263         return ret;
 264 }
 265 
 266 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
 267 {
 268         return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
 269                ((ilog2(cw_max + 1) << 0x4) & 0xf0);
 270 }
 271 
 272 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
 273                                             struct sk_buff *skb)
 274 {
 275         struct ieee80211_wmm_param_ie *wmm;
 276         struct ieee80211_tx_queue_params *txq;
 277         int i;
 278 
 279         wmm = skb_put_zero(skb, sizeof(*wmm));
 280 
 281         wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
 282         wmm->len = sizeof(*wmm) - 2;
 283 
 284         wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
 285         wmm->oui[1] = 0x50;
 286         wmm->oui[2] = 0xf2;
 287         wmm->oui_type = 2; /* WME */
 288         wmm->oui_subtype = 1; /* WME param */
 289         wmm->version = 1; /* WME ver */
 290         wmm->qos_info = 0; /* U-APSD not in use */
 291 
 292         /*
 293          * Use the EDCA parameters defined for the BSS, or default if the AP
 294          * doesn't support it, as mandated by 802.11-2012 section 10.22.4
 295          */
 296         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 297                 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
 298                 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
 299                                                                txq->acm, i);
 300                 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
 301                 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
 302         }
 303 }
 304 
 305 static void
 306 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
 307                                    struct sta_info *sta)
 308 {
 309         /* IEEE802.11ac-2013 Table E-4 */
 310         u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
 311         struct cfg80211_chan_def uc = sta->tdls_chandef;
 312         enum nl80211_chan_width max_width = ieee80211_sta_cap_chan_bw(sta);
 313         int i;
 314 
 315         /* only support upgrading non-narrow channels up to 80Mhz */
 316         if (max_width == NL80211_CHAN_WIDTH_5 ||
 317             max_width == NL80211_CHAN_WIDTH_10)
 318                 return;
 319 
 320         if (max_width > NL80211_CHAN_WIDTH_80)
 321                 max_width = NL80211_CHAN_WIDTH_80;
 322 
 323         if (uc.width >= max_width)
 324                 return;
 325         /*
 326          * Channel usage constrains in the IEEE802.11ac-2013 specification only
 327          * allow expanding a 20MHz channel to 80MHz in a single way. In
 328          * addition, there are no 40MHz allowed channels that are not part of
 329          * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
 330          */
 331         for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
 332                 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
 333                         uc.center_freq1 = centers_80mhz[i];
 334                         uc.center_freq2 = 0;
 335                         uc.width = NL80211_CHAN_WIDTH_80;
 336                         break;
 337                 }
 338 
 339         if (!uc.center_freq1)
 340                 return;
 341 
 342         /* proceed to downgrade the chandef until usable or the same as AP BW */
 343         while (uc.width > max_width ||
 344                (uc.width > sta->tdls_chandef.width &&
 345                 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
 346                                                sdata->wdev.iftype)))
 347                 ieee80211_chandef_downgrade(&uc);
 348 
 349         if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
 350                 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
 351                          sta->tdls_chandef.width, uc.width);
 352 
 353                 /*
 354                  * the station is not yet authorized when BW upgrade is done,
 355                  * locking is not required
 356                  */
 357                 sta->tdls_chandef = uc;
 358         }
 359 }
 360 
 361 static void
 362 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
 363                                    struct sk_buff *skb, const u8 *peer,
 364                                    u8 action_code, bool initiator,
 365                                    const u8 *extra_ies, size_t extra_ies_len)
 366 {
 367         struct ieee80211_supported_band *sband;
 368         struct ieee80211_local *local = sdata->local;
 369         struct ieee80211_sta_ht_cap ht_cap;
 370         struct ieee80211_sta_vht_cap vht_cap;
 371         struct sta_info *sta = NULL;
 372         size_t offset = 0, noffset;
 373         u8 *pos;
 374 
 375         sband = ieee80211_get_sband(sdata);
 376         if (!sband)
 377                 return;
 378 
 379         ieee80211_add_srates_ie(sdata, skb, false, sband->band);
 380         ieee80211_add_ext_srates_ie(sdata, skb, false, sband->band);
 381         ieee80211_tdls_add_supp_channels(sdata, skb);
 382 
 383         /* add any custom IEs that go before Extended Capabilities */
 384         if (extra_ies_len) {
 385                 static const u8 before_ext_cap[] = {
 386                         WLAN_EID_SUPP_RATES,
 387                         WLAN_EID_COUNTRY,
 388                         WLAN_EID_EXT_SUPP_RATES,
 389                         WLAN_EID_SUPPORTED_CHANNELS,
 390                         WLAN_EID_RSN,
 391                 };
 392                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 393                                              before_ext_cap,
 394                                              ARRAY_SIZE(before_ext_cap),
 395                                              offset);
 396                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 397                 offset = noffset;
 398         }
 399 
 400         ieee80211_tdls_add_ext_capab(sdata, skb);
 401 
 402         /* add the QoS element if we support it */
 403         if (local->hw.queues >= IEEE80211_NUM_ACS &&
 404             action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
 405                 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
 406 
 407         /* add any custom IEs that go before HT capabilities */
 408         if (extra_ies_len) {
 409                 static const u8 before_ht_cap[] = {
 410                         WLAN_EID_SUPP_RATES,
 411                         WLAN_EID_COUNTRY,
 412                         WLAN_EID_EXT_SUPP_RATES,
 413                         WLAN_EID_SUPPORTED_CHANNELS,
 414                         WLAN_EID_RSN,
 415                         WLAN_EID_EXT_CAPABILITY,
 416                         WLAN_EID_QOS_CAPA,
 417                         WLAN_EID_FAST_BSS_TRANSITION,
 418                         WLAN_EID_TIMEOUT_INTERVAL,
 419                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 420                 };
 421                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 422                                              before_ht_cap,
 423                                              ARRAY_SIZE(before_ht_cap),
 424                                              offset);
 425                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 426                 offset = noffset;
 427         }
 428 
 429         mutex_lock(&local->sta_mtx);
 430 
 431         /* we should have the peer STA if we're already responding */
 432         if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
 433                 sta = sta_info_get(sdata, peer);
 434                 if (WARN_ON_ONCE(!sta)) {
 435                         mutex_unlock(&local->sta_mtx);
 436                         return;
 437                 }
 438 
 439                 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
 440         }
 441 
 442         ieee80211_tdls_add_oper_classes(sdata, skb);
 443 
 444         /*
 445          * with TDLS we can switch channels, and HT-caps are not necessarily
 446          * the same on all bands. The specification limits the setup to a
 447          * single HT-cap, so use the current band for now.
 448          */
 449         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 450 
 451         if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 452              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 453             ht_cap.ht_supported) {
 454                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 455 
 456                 /* disable SMPS in TDLS initiator */
 457                 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
 458                                 << IEEE80211_HT_CAP_SM_PS_SHIFT;
 459 
 460                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 461                 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 462         } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 463                    ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
 464                 /* the peer caps are already intersected with our own */
 465                 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
 466 
 467                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 468                 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 469         }
 470 
 471         if (ht_cap.ht_supported &&
 472             (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
 473                 ieee80211_tdls_add_bss_coex_ie(skb);
 474 
 475         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 476 
 477         /* add any custom IEs that go before VHT capabilities */
 478         if (extra_ies_len) {
 479                 static const u8 before_vht_cap[] = {
 480                         WLAN_EID_SUPP_RATES,
 481                         WLAN_EID_COUNTRY,
 482                         WLAN_EID_EXT_SUPP_RATES,
 483                         WLAN_EID_SUPPORTED_CHANNELS,
 484                         WLAN_EID_RSN,
 485                         WLAN_EID_EXT_CAPABILITY,
 486                         WLAN_EID_QOS_CAPA,
 487                         WLAN_EID_FAST_BSS_TRANSITION,
 488                         WLAN_EID_TIMEOUT_INTERVAL,
 489                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 490                         WLAN_EID_MULTI_BAND,
 491                 };
 492                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 493                                              before_vht_cap,
 494                                              ARRAY_SIZE(before_vht_cap),
 495                                              offset);
 496                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 497                 offset = noffset;
 498         }
 499 
 500         /* build the VHT-cap similarly to the HT-cap */
 501         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 502         if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 503              action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 504             vht_cap.vht_supported) {
 505                 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 506 
 507                 /* the AID is present only when VHT is implemented */
 508                 if (action_code == WLAN_TDLS_SETUP_REQUEST)
 509                         ieee80211_tdls_add_aid(sdata, skb);
 510 
 511                 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 512                 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 513         } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 514                    vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
 515                 /* the peer caps are already intersected with our own */
 516                 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
 517 
 518                 /* the AID is present only when VHT is implemented */
 519                 ieee80211_tdls_add_aid(sdata, skb);
 520 
 521                 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 522                 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 523 
 524                 /*
 525                  * if both peers support WIDER_BW, we can expand the chandef to
 526                  * a wider compatible one, up to 80MHz
 527                  */
 528                 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 529                         ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 530         }
 531 
 532         mutex_unlock(&local->sta_mtx);
 533 
 534         /* add any remaining IEs */
 535         if (extra_ies_len) {
 536                 noffset = extra_ies_len;
 537                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 538         }
 539 
 540 }
 541 
 542 static void
 543 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
 544                                  struct sk_buff *skb, const u8 *peer,
 545                                  bool initiator, const u8 *extra_ies,
 546                                  size_t extra_ies_len)
 547 {
 548         struct ieee80211_local *local = sdata->local;
 549         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 550         size_t offset = 0, noffset;
 551         struct sta_info *sta, *ap_sta;
 552         struct ieee80211_supported_band *sband;
 553         u8 *pos;
 554 
 555         sband = ieee80211_get_sband(sdata);
 556         if (!sband)
 557                 return;
 558 
 559         mutex_lock(&local->sta_mtx);
 560 
 561         sta = sta_info_get(sdata, peer);
 562         ap_sta = sta_info_get(sdata, ifmgd->bssid);
 563         if (WARN_ON_ONCE(!sta || !ap_sta)) {
 564                 mutex_unlock(&local->sta_mtx);
 565                 return;
 566         }
 567 
 568         sta->tdls_chandef = sdata->vif.bss_conf.chandef;
 569 
 570         /* add any custom IEs that go before the QoS IE */
 571         if (extra_ies_len) {
 572                 static const u8 before_qos[] = {
 573                         WLAN_EID_RSN,
 574                 };
 575                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 576                                              before_qos,
 577                                              ARRAY_SIZE(before_qos),
 578                                              offset);
 579                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 580                 offset = noffset;
 581         }
 582 
 583         /* add the QoS param IE if both the peer and we support it */
 584         if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
 585                 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
 586 
 587         /* add any custom IEs that go before HT operation */
 588         if (extra_ies_len) {
 589                 static const u8 before_ht_op[] = {
 590                         WLAN_EID_RSN,
 591                         WLAN_EID_QOS_CAPA,
 592                         WLAN_EID_FAST_BSS_TRANSITION,
 593                         WLAN_EID_TIMEOUT_INTERVAL,
 594                 };
 595                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 596                                              before_ht_op,
 597                                              ARRAY_SIZE(before_ht_op),
 598                                              offset);
 599                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 600                 offset = noffset;
 601         }
 602 
 603         /*
 604          * if HT support is only added in TDLS, we need an HT-operation IE.
 605          * add the IE as required by IEEE802.11-2012 9.23.3.2.
 606          */
 607         if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
 608                 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
 609                            IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
 610                            IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
 611 
 612                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 613                 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
 614                                            &sdata->vif.bss_conf.chandef, prot,
 615                                            true);
 616         }
 617 
 618         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 619 
 620         /* only include VHT-operation if not on the 2.4GHz band */
 621         if (sband->band != NL80211_BAND_2GHZ &&
 622             sta->sta.vht_cap.vht_supported) {
 623                 /*
 624                  * if both peers support WIDER_BW, we can expand the chandef to
 625                  * a wider compatible one, up to 80MHz
 626                  */
 627                 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 628                         ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 629 
 630                 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 631                 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
 632                                             &sta->tdls_chandef);
 633         }
 634 
 635         mutex_unlock(&local->sta_mtx);
 636 
 637         /* add any remaining IEs */
 638         if (extra_ies_len) {
 639                 noffset = extra_ies_len;
 640                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 641         }
 642 }
 643 
 644 static void
 645 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
 646                                        struct sk_buff *skb, const u8 *peer,
 647                                        bool initiator, const u8 *extra_ies,
 648                                        size_t extra_ies_len, u8 oper_class,
 649                                        struct cfg80211_chan_def *chandef)
 650 {
 651         struct ieee80211_tdls_data *tf;
 652         size_t offset = 0, noffset;
 653 
 654         if (WARN_ON_ONCE(!chandef))
 655                 return;
 656 
 657         tf = (void *)skb->data;
 658         tf->u.chan_switch_req.target_channel =
 659                 ieee80211_frequency_to_channel(chandef->chan->center_freq);
 660         tf->u.chan_switch_req.oper_class = oper_class;
 661 
 662         if (extra_ies_len) {
 663                 static const u8 before_lnkie[] = {
 664                         WLAN_EID_SECONDARY_CHANNEL_OFFSET,
 665                 };
 666                 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 667                                              before_lnkie,
 668                                              ARRAY_SIZE(before_lnkie),
 669                                              offset);
 670                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 671                 offset = noffset;
 672         }
 673 
 674         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 675 
 676         /* add any remaining IEs */
 677         if (extra_ies_len) {
 678                 noffset = extra_ies_len;
 679                 skb_put_data(skb, extra_ies + offset, noffset - offset);
 680         }
 681 }
 682 
 683 static void
 684 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
 685                                         struct sk_buff *skb, const u8 *peer,
 686                                         u16 status_code, bool initiator,
 687                                         const u8 *extra_ies,
 688                                         size_t extra_ies_len)
 689 {
 690         if (status_code == 0)
 691                 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 692 
 693         if (extra_ies_len)
 694                 skb_put_data(skb, extra_ies, extra_ies_len);
 695 }
 696 
 697 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
 698                                    struct sk_buff *skb, const u8 *peer,
 699                                    u8 action_code, u16 status_code,
 700                                    bool initiator, const u8 *extra_ies,
 701                                    size_t extra_ies_len, u8 oper_class,
 702                                    struct cfg80211_chan_def *chandef)
 703 {
 704         switch (action_code) {
 705         case WLAN_TDLS_SETUP_REQUEST:
 706         case WLAN_TDLS_SETUP_RESPONSE:
 707         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 708                 if (status_code == 0)
 709                         ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
 710                                                            action_code,
 711                                                            initiator,
 712                                                            extra_ies,
 713                                                            extra_ies_len);
 714                 break;
 715         case WLAN_TDLS_SETUP_CONFIRM:
 716                 if (status_code == 0)
 717                         ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
 718                                                          initiator, extra_ies,
 719                                                          extra_ies_len);
 720                 break;
 721         case WLAN_TDLS_TEARDOWN:
 722         case WLAN_TDLS_DISCOVERY_REQUEST:
 723                 if (extra_ies_len)
 724                         skb_put_data(skb, extra_ies, extra_ies_len);
 725                 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
 726                         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 727                 break;
 728         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 729                 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
 730                                                        initiator, extra_ies,
 731                                                        extra_ies_len,
 732                                                        oper_class, chandef);
 733                 break;
 734         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 735                 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
 736                                                         status_code,
 737                                                         initiator, extra_ies,
 738                                                         extra_ies_len);
 739                 break;
 740         }
 741 
 742 }
 743 
 744 static int
 745 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
 746                                const u8 *peer, u8 action_code, u8 dialog_token,
 747                                u16 status_code, struct sk_buff *skb)
 748 {
 749         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 750         struct ieee80211_tdls_data *tf;
 751 
 752         tf = skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
 753 
 754         memcpy(tf->da, peer, ETH_ALEN);
 755         memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
 756         tf->ether_type = cpu_to_be16(ETH_P_TDLS);
 757         tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
 758 
 759         /* network header is after the ethernet header */
 760         skb_set_network_header(skb, ETH_HLEN);
 761 
 762         switch (action_code) {
 763         case WLAN_TDLS_SETUP_REQUEST:
 764                 tf->category = WLAN_CATEGORY_TDLS;
 765                 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
 766 
 767                 skb_put(skb, sizeof(tf->u.setup_req));
 768                 tf->u.setup_req.dialog_token = dialog_token;
 769                 tf->u.setup_req.capability =
 770                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 771                                                                  status_code));
 772                 break;
 773         case WLAN_TDLS_SETUP_RESPONSE:
 774                 tf->category = WLAN_CATEGORY_TDLS;
 775                 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
 776 
 777                 skb_put(skb, sizeof(tf->u.setup_resp));
 778                 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
 779                 tf->u.setup_resp.dialog_token = dialog_token;
 780                 tf->u.setup_resp.capability =
 781                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 782                                                                  status_code));
 783                 break;
 784         case WLAN_TDLS_SETUP_CONFIRM:
 785                 tf->category = WLAN_CATEGORY_TDLS;
 786                 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
 787 
 788                 skb_put(skb, sizeof(tf->u.setup_cfm));
 789                 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
 790                 tf->u.setup_cfm.dialog_token = dialog_token;
 791                 break;
 792         case WLAN_TDLS_TEARDOWN:
 793                 tf->category = WLAN_CATEGORY_TDLS;
 794                 tf->action_code = WLAN_TDLS_TEARDOWN;
 795 
 796                 skb_put(skb, sizeof(tf->u.teardown));
 797                 tf->u.teardown.reason_code = cpu_to_le16(status_code);
 798                 break;
 799         case WLAN_TDLS_DISCOVERY_REQUEST:
 800                 tf->category = WLAN_CATEGORY_TDLS;
 801                 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
 802 
 803                 skb_put(skb, sizeof(tf->u.discover_req));
 804                 tf->u.discover_req.dialog_token = dialog_token;
 805                 break;
 806         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 807                 tf->category = WLAN_CATEGORY_TDLS;
 808                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
 809 
 810                 skb_put(skb, sizeof(tf->u.chan_switch_req));
 811                 break;
 812         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 813                 tf->category = WLAN_CATEGORY_TDLS;
 814                 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
 815 
 816                 skb_put(skb, sizeof(tf->u.chan_switch_resp));
 817                 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
 818                 break;
 819         default:
 820                 return -EINVAL;
 821         }
 822 
 823         return 0;
 824 }
 825 
 826 static int
 827 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
 828                            const u8 *peer, u8 action_code, u8 dialog_token,
 829                            u16 status_code, struct sk_buff *skb)
 830 {
 831         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 832         struct ieee80211_mgmt *mgmt;
 833 
 834         mgmt = skb_put_zero(skb, 24);
 835         memcpy(mgmt->da, peer, ETH_ALEN);
 836         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 837         memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 838 
 839         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 840                                           IEEE80211_STYPE_ACTION);
 841 
 842         switch (action_code) {
 843         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 844                 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
 845                 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
 846                 mgmt->u.action.u.tdls_discover_resp.action_code =
 847                         WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
 848                 mgmt->u.action.u.tdls_discover_resp.dialog_token =
 849                         dialog_token;
 850                 mgmt->u.action.u.tdls_discover_resp.capability =
 851                         cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 852                                                                  status_code));
 853                 break;
 854         default:
 855                 return -EINVAL;
 856         }
 857 
 858         return 0;
 859 }
 860 
 861 static struct sk_buff *
 862 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
 863                                       const u8 *peer, u8 action_code,
 864                                       u8 dialog_token, u16 status_code,
 865                                       bool initiator, const u8 *extra_ies,
 866                                       size_t extra_ies_len, u8 oper_class,
 867                                       struct cfg80211_chan_def *chandef)
 868 {
 869         struct ieee80211_local *local = sdata->local;
 870         struct sk_buff *skb;
 871         int ret;
 872 
 873         skb = netdev_alloc_skb(sdata->dev,
 874                                local->hw.extra_tx_headroom +
 875                                max(sizeof(struct ieee80211_mgmt),
 876                                    sizeof(struct ieee80211_tdls_data)) +
 877                                50 + /* supported rates */
 878                                10 + /* ext capab */
 879                                26 + /* max(WMM-info, WMM-param) */
 880                                2 + max(sizeof(struct ieee80211_ht_cap),
 881                                        sizeof(struct ieee80211_ht_operation)) +
 882                                2 + max(sizeof(struct ieee80211_vht_cap),
 883                                        sizeof(struct ieee80211_vht_operation)) +
 884                                50 + /* supported channels */
 885                                3 + /* 40/20 BSS coex */
 886                                4 + /* AID */
 887                                4 + /* oper classes */
 888                                extra_ies_len +
 889                                sizeof(struct ieee80211_tdls_lnkie));
 890         if (!skb)
 891                 return NULL;
 892 
 893         skb_reserve(skb, local->hw.extra_tx_headroom);
 894 
 895         switch (action_code) {
 896         case WLAN_TDLS_SETUP_REQUEST:
 897         case WLAN_TDLS_SETUP_RESPONSE:
 898         case WLAN_TDLS_SETUP_CONFIRM:
 899         case WLAN_TDLS_TEARDOWN:
 900         case WLAN_TDLS_DISCOVERY_REQUEST:
 901         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 902         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 903                 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
 904                                                      sdata->dev, peer,
 905                                                      action_code, dialog_token,
 906                                                      status_code, skb);
 907                 break;
 908         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 909                 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
 910                                                  peer, action_code,
 911                                                  dialog_token, status_code,
 912                                                  skb);
 913                 break;
 914         default:
 915                 ret = -ENOTSUPP;
 916                 break;
 917         }
 918 
 919         if (ret < 0)
 920                 goto fail;
 921 
 922         ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
 923                                initiator, extra_ies, extra_ies_len, oper_class,
 924                                chandef);
 925         return skb;
 926 
 927 fail:
 928         dev_kfree_skb(skb);
 929         return NULL;
 930 }
 931 
 932 static int
 933 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
 934                                 const u8 *peer, u8 action_code, u8 dialog_token,
 935                                 u16 status_code, u32 peer_capability,
 936                                 bool initiator, const u8 *extra_ies,
 937                                 size_t extra_ies_len, u8 oper_class,
 938                                 struct cfg80211_chan_def *chandef)
 939 {
 940         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 941         struct sk_buff *skb = NULL;
 942         struct sta_info *sta;
 943         u32 flags = 0;
 944         int ret = 0;
 945 
 946         rcu_read_lock();
 947         sta = sta_info_get(sdata, peer);
 948 
 949         /* infer the initiator if we can, to support old userspace */
 950         switch (action_code) {
 951         case WLAN_TDLS_SETUP_REQUEST:
 952                 if (sta) {
 953                         set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
 954                         sta->sta.tdls_initiator = false;
 955                 }
 956                 /* fall-through */
 957         case WLAN_TDLS_SETUP_CONFIRM:
 958         case WLAN_TDLS_DISCOVERY_REQUEST:
 959                 initiator = true;
 960                 break;
 961         case WLAN_TDLS_SETUP_RESPONSE:
 962                 /*
 963                  * In some testing scenarios, we send a request and response.
 964                  * Make the last packet sent take effect for the initiator
 965                  * value.
 966                  */
 967                 if (sta) {
 968                         clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
 969                         sta->sta.tdls_initiator = true;
 970                 }
 971                 /* fall-through */
 972         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 973                 initiator = false;
 974                 break;
 975         case WLAN_TDLS_TEARDOWN:
 976         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 977         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 978                 /* any value is ok */
 979                 break;
 980         default:
 981                 ret = -ENOTSUPP;
 982                 break;
 983         }
 984 
 985         if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
 986                 initiator = true;
 987 
 988         rcu_read_unlock();
 989         if (ret < 0)
 990                 goto fail;
 991 
 992         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
 993                                                     dialog_token, status_code,
 994                                                     initiator, extra_ies,
 995                                                     extra_ies_len, oper_class,
 996                                                     chandef);
 997         if (!skb) {
 998                 ret = -EINVAL;
 999                 goto fail;
1000         }
1001 
1002         if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
1003                 ieee80211_tx_skb(sdata, skb);
1004                 return 0;
1005         }
1006 
1007         /*
1008          * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1009          * we should default to AC_VI.
1010          */
1011         switch (action_code) {
1012         case WLAN_TDLS_SETUP_REQUEST:
1013         case WLAN_TDLS_SETUP_RESPONSE:
1014                 skb->priority = 256 + 2;
1015                 break;
1016         default:
1017                 skb->priority = 256 + 5;
1018                 break;
1019         }
1020         skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, skb));
1021 
1022         /*
1023          * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1024          * Later, if no ACK is returned from peer, we will re-send the teardown
1025          * packet through the AP.
1026          */
1027         if ((action_code == WLAN_TDLS_TEARDOWN) &&
1028             ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1029                 bool try_resend; /* Should we keep skb for possible resend */
1030 
1031                 /* If not sending directly to peer - no point in keeping skb */
1032                 rcu_read_lock();
1033                 sta = sta_info_get(sdata, peer);
1034                 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1035                 rcu_read_unlock();
1036 
1037                 spin_lock_bh(&sdata->u.mgd.teardown_lock);
1038                 if (try_resend && !sdata->u.mgd.teardown_skb) {
1039                         /* Mark it as requiring TX status callback  */
1040                         flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1041                                  IEEE80211_TX_INTFL_MLME_CONN_TX;
1042 
1043                         /*
1044                          * skb is copied since mac80211 will later set
1045                          * properties that might not be the same as the AP,
1046                          * such as encryption, QoS, addresses, etc.
1047                          *
1048                          * No problem if skb_copy() fails, so no need to check.
1049                          */
1050                         sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1051                         sdata->u.mgd.orig_teardown_skb = skb;
1052                 }
1053                 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1054         }
1055 
1056         /* disable bottom halves when entering the Tx path */
1057         local_bh_disable();
1058         __ieee80211_subif_start_xmit(skb, dev, flags, 0);
1059         local_bh_enable();
1060 
1061         return ret;
1062 
1063 fail:
1064         dev_kfree_skb(skb);
1065         return ret;
1066 }
1067 
1068 static int
1069 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1070                           const u8 *peer, u8 action_code, u8 dialog_token,
1071                           u16 status_code, u32 peer_capability, bool initiator,
1072                           const u8 *extra_ies, size_t extra_ies_len)
1073 {
1074         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1075         struct ieee80211_local *local = sdata->local;
1076         enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode;
1077         int ret;
1078 
1079         /* don't support setup with forced SMPS mode that's not off */
1080         if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1081             smps_mode != IEEE80211_SMPS_OFF) {
1082                 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1083                          smps_mode);
1084                 return -ENOTSUPP;
1085         }
1086 
1087         mutex_lock(&local->mtx);
1088 
1089         /* we don't support concurrent TDLS peer setups */
1090         if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1091             !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1092                 ret = -EBUSY;
1093                 goto out_unlock;
1094         }
1095 
1096         /*
1097          * make sure we have a STA representing the peer so we drop or buffer
1098          * non-TDLS-setup frames to the peer. We can't send other packets
1099          * during setup through the AP path.
1100          * Allow error packets to be sent - sometimes we don't even add a STA
1101          * before failing the setup.
1102          */
1103         if (status_code == 0) {
1104                 rcu_read_lock();
1105                 if (!sta_info_get(sdata, peer)) {
1106                         rcu_read_unlock();
1107                         ret = -ENOLINK;
1108                         goto out_unlock;
1109                 }
1110                 rcu_read_unlock();
1111         }
1112 
1113         ieee80211_flush_queues(local, sdata, false);
1114         memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1115         mutex_unlock(&local->mtx);
1116 
1117         /* we cannot take the mutex while preparing the setup packet */
1118         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1119                                               dialog_token, status_code,
1120                                               peer_capability, initiator,
1121                                               extra_ies, extra_ies_len, 0,
1122                                               NULL);
1123         if (ret < 0) {
1124                 mutex_lock(&local->mtx);
1125                 eth_zero_addr(sdata->u.mgd.tdls_peer);
1126                 mutex_unlock(&local->mtx);
1127                 return ret;
1128         }
1129 
1130         ieee80211_queue_delayed_work(&sdata->local->hw,
1131                                      &sdata->u.mgd.tdls_peer_del_work,
1132                                      TDLS_PEER_SETUP_TIMEOUT);
1133         return 0;
1134 
1135 out_unlock:
1136         mutex_unlock(&local->mtx);
1137         return ret;
1138 }
1139 
1140 static int
1141 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1142                              const u8 *peer, u8 action_code, u8 dialog_token,
1143                              u16 status_code, u32 peer_capability,
1144                              bool initiator, const u8 *extra_ies,
1145                              size_t extra_ies_len)
1146 {
1147         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1148         struct ieee80211_local *local = sdata->local;
1149         struct sta_info *sta;
1150         int ret;
1151 
1152         /*
1153          * No packets can be transmitted to the peer via the AP during setup -
1154          * the STA is set as a TDLS peer, but is not authorized.
1155          * During teardown, we prevent direct transmissions by stopping the
1156          * queues and flushing all direct packets.
1157          */
1158         ieee80211_stop_vif_queues(local, sdata,
1159                                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1160         ieee80211_flush_queues(local, sdata, false);
1161 
1162         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1163                                               dialog_token, status_code,
1164                                               peer_capability, initiator,
1165                                               extra_ies, extra_ies_len, 0,
1166                                               NULL);
1167         if (ret < 0)
1168                 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1169                           ret);
1170 
1171         /*
1172          * Remove the STA AUTH flag to force further traffic through the AP. If
1173          * the STA was unreachable, it was already removed.
1174          */
1175         rcu_read_lock();
1176         sta = sta_info_get(sdata, peer);
1177         if (sta)
1178                 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1179         rcu_read_unlock();
1180 
1181         ieee80211_wake_vif_queues(local, sdata,
1182                                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1183 
1184         return 0;
1185 }
1186 
1187 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1188                         const u8 *peer, u8 action_code, u8 dialog_token,
1189                         u16 status_code, u32 peer_capability,
1190                         bool initiator, const u8 *extra_ies,
1191                         size_t extra_ies_len)
1192 {
1193         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1194         int ret;
1195 
1196         if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1197                 return -ENOTSUPP;
1198 
1199         /* make sure we are in managed mode, and associated */
1200         if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1201             !sdata->u.mgd.associated)
1202                 return -EINVAL;
1203 
1204         switch (action_code) {
1205         case WLAN_TDLS_SETUP_REQUEST:
1206         case WLAN_TDLS_SETUP_RESPONSE:
1207                 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1208                                                 dialog_token, status_code,
1209                                                 peer_capability, initiator,
1210                                                 extra_ies, extra_ies_len);
1211                 break;
1212         case WLAN_TDLS_TEARDOWN:
1213                 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1214                                                    action_code, dialog_token,
1215                                                    status_code,
1216                                                    peer_capability, initiator,
1217                                                    extra_ies, extra_ies_len);
1218                 break;
1219         case WLAN_TDLS_DISCOVERY_REQUEST:
1220                 /*
1221                  * Protect the discovery so we can hear the TDLS discovery
1222                  * response frame. It is transmitted directly and not buffered
1223                  * by the AP.
1224                  */
1225                 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1226                 /* fall-through */
1227         case WLAN_TDLS_SETUP_CONFIRM:
1228         case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1229                 /* no special handling */
1230                 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1231                                                       action_code,
1232                                                       dialog_token,
1233                                                       status_code,
1234                                                       peer_capability,
1235                                                       initiator, extra_ies,
1236                                                       extra_ies_len, 0, NULL);
1237                 break;
1238         default:
1239                 ret = -EOPNOTSUPP;
1240                 break;
1241         }
1242 
1243         tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1244                  action_code, peer, ret);
1245         return ret;
1246 }
1247 
1248 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1249                                          struct sta_info *sta)
1250 {
1251         struct ieee80211_local *local = sdata->local;
1252         struct ieee80211_chanctx_conf *conf;
1253         struct ieee80211_chanctx *ctx;
1254         enum nl80211_chan_width width;
1255         struct ieee80211_supported_band *sband;
1256 
1257         mutex_lock(&local->chanctx_mtx);
1258         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1259                                          lockdep_is_held(&local->chanctx_mtx));
1260         if (conf) {
1261                 width = conf->def.width;
1262                 sband = local->hw.wiphy->bands[conf->def.chan->band];
1263                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1264                 ieee80211_recalc_chanctx_chantype(local, ctx);
1265 
1266                 /* if width changed and a peer is given, update its BW */
1267                 if (width != conf->def.width && sta &&
1268                     test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1269                         enum ieee80211_sta_rx_bandwidth bw;
1270 
1271                         bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1272                         bw = min(bw, ieee80211_sta_cap_rx_bw(sta));
1273                         if (bw != sta->sta.bandwidth) {
1274                                 sta->sta.bandwidth = bw;
1275                                 rate_control_rate_update(local, sband, sta,
1276                                                          IEEE80211_RC_BW_CHANGED);
1277                                 /*
1278                                  * if a TDLS peer BW was updated, we need to
1279                                  * recalc the chandef width again, to get the
1280                                  * correct chanctx min_def
1281                                  */
1282                                 ieee80211_recalc_chanctx_chantype(local, ctx);
1283                         }
1284                 }
1285 
1286         }
1287         mutex_unlock(&local->chanctx_mtx);
1288 }
1289 
1290 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1291 {
1292         struct sta_info *sta;
1293         bool result = false;
1294 
1295         rcu_read_lock();
1296         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1297                 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1298                     !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1299                     !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1300                     !sta->sta.ht_cap.ht_supported)
1301                         continue;
1302                 result = true;
1303                 break;
1304         }
1305         rcu_read_unlock();
1306 
1307         return result;
1308 }
1309 
1310 static void
1311 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1312                                    struct sta_info *sta)
1313 {
1314         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1315         bool tdls_ht;
1316         u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1317                          IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1318                          IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1319         u16 opmode;
1320 
1321         /* Nothing to do if the BSS connection uses HT */
1322         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
1323                 return;
1324 
1325         tdls_ht = (sta && sta->sta.ht_cap.ht_supported) ||
1326                   iee80211_tdls_have_ht_peers(sdata);
1327 
1328         opmode = sdata->vif.bss_conf.ht_operation_mode;
1329 
1330         if (tdls_ht)
1331                 opmode |= protection;
1332         else
1333                 opmode &= ~protection;
1334 
1335         if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1336                 return;
1337 
1338         sdata->vif.bss_conf.ht_operation_mode = opmode;
1339         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT);
1340 }
1341 
1342 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1343                         const u8 *peer, enum nl80211_tdls_operation oper)
1344 {
1345         struct sta_info *sta;
1346         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1347         struct ieee80211_local *local = sdata->local;
1348         int ret;
1349 
1350         if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1351                 return -ENOTSUPP;
1352 
1353         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1354                 return -EINVAL;
1355 
1356         switch (oper) {
1357         case NL80211_TDLS_ENABLE_LINK:
1358         case NL80211_TDLS_DISABLE_LINK:
1359                 break;
1360         case NL80211_TDLS_TEARDOWN:
1361         case NL80211_TDLS_SETUP:
1362         case NL80211_TDLS_DISCOVERY_REQ:
1363                 /* We don't support in-driver setup/teardown/discovery */
1364                 return -ENOTSUPP;
1365         }
1366 
1367         /* protect possible bss_conf changes and avoid concurrency in
1368          * ieee80211_bss_info_change_notify()
1369          */
1370         sdata_lock(sdata);
1371         mutex_lock(&local->mtx);
1372         tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1373 
1374         switch (oper) {
1375         case NL80211_TDLS_ENABLE_LINK:
1376                 if (sdata->vif.csa_active) {
1377                         tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1378                         ret = -EBUSY;
1379                         break;
1380                 }
1381 
1382                 mutex_lock(&local->sta_mtx);
1383                 sta = sta_info_get(sdata, peer);
1384                 if (!sta) {
1385                         mutex_unlock(&local->sta_mtx);
1386                         ret = -ENOLINK;
1387                         break;
1388                 }
1389 
1390                 iee80211_tdls_recalc_chanctx(sdata, sta);
1391                 iee80211_tdls_recalc_ht_protection(sdata, sta);
1392 
1393                 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1394                 mutex_unlock(&local->sta_mtx);
1395 
1396                 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1397                              !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1398                 ret = 0;
1399                 break;
1400         case NL80211_TDLS_DISABLE_LINK:
1401                 /*
1402                  * The teardown message in ieee80211_tdls_mgmt_teardown() was
1403                  * created while the queues were stopped, so it might still be
1404                  * pending. Before flushing the queues we need to be sure the
1405                  * message is handled by the tasklet handling pending messages,
1406                  * otherwise we might start destroying the station before
1407                  * sending the teardown packet.
1408                  * Note that this only forces the tasklet to flush pendings -
1409                  * not to stop the tasklet from rescheduling itself.
1410                  */
1411                 tasklet_kill(&local->tx_pending_tasklet);
1412                 /* flush a potentially queued teardown packet */
1413                 ieee80211_flush_queues(local, sdata, false);
1414 
1415                 ret = sta_info_destroy_addr(sdata, peer);
1416 
1417                 mutex_lock(&local->sta_mtx);
1418                 iee80211_tdls_recalc_ht_protection(sdata, NULL);
1419                 mutex_unlock(&local->sta_mtx);
1420 
1421                 iee80211_tdls_recalc_chanctx(sdata, NULL);
1422                 break;
1423         default:
1424                 ret = -ENOTSUPP;
1425                 break;
1426         }
1427 
1428         if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1429                 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1430                 eth_zero_addr(sdata->u.mgd.tdls_peer);
1431         }
1432 
1433         if (ret == 0)
1434                 ieee80211_queue_work(&sdata->local->hw,
1435                                      &sdata->u.mgd.request_smps_work);
1436 
1437         mutex_unlock(&local->mtx);
1438         sdata_unlock(sdata);
1439         return ret;
1440 }
1441 
1442 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1443                                  enum nl80211_tdls_operation oper,
1444                                  u16 reason_code, gfp_t gfp)
1445 {
1446         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1447 
1448         if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1449                 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1450                           oper);
1451                 return;
1452         }
1453 
1454         cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1455 }
1456 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1457 
1458 static void
1459 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1460 {
1461         struct ieee80211_ch_switch_timing *ch_sw;
1462 
1463         *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1464         *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1465 
1466         ch_sw = (void *)buf;
1467         ch_sw->switch_time = cpu_to_le16(switch_time);
1468         ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1469 }
1470 
1471 /* find switch timing IE in SKB ready for Tx */
1472 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1473 {
1474         struct ieee80211_tdls_data *tf;
1475         const u8 *ie_start;
1476 
1477         /*
1478          * Get the offset for the new location of the switch timing IE.
1479          * The SKB network header will now point to the "payload_type"
1480          * element of the TDLS data frame struct.
1481          */
1482         tf = container_of(skb->data + skb_network_offset(skb),
1483                           struct ieee80211_tdls_data, payload_type);
1484         ie_start = tf->u.chan_switch_req.variable;
1485         return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1486                                 skb->len - (ie_start - skb->data));
1487 }
1488 
1489 static struct sk_buff *
1490 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1491                               struct cfg80211_chan_def *chandef,
1492                               u32 *ch_sw_tm_ie_offset)
1493 {
1494         struct ieee80211_sub_if_data *sdata = sta->sdata;
1495         u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1496                      2 + sizeof(struct ieee80211_ch_switch_timing)];
1497         int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1498         u8 *pos = extra_ies;
1499         struct sk_buff *skb;
1500 
1501         /*
1502          * if chandef points to a wide channel add a Secondary-Channel
1503          * Offset information element
1504          */
1505         if (chandef->width == NL80211_CHAN_WIDTH_40) {
1506                 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1507                 bool ht40plus;
1508 
1509                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1510                 *pos++ = sizeof(*sec_chan_ie);
1511                 sec_chan_ie = (void *)pos;
1512 
1513                 ht40plus = cfg80211_get_chandef_type(chandef) ==
1514                                                         NL80211_CHAN_HT40PLUS;
1515                 sec_chan_ie->sec_chan_offs = ht40plus ?
1516                                              IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1517                                              IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1518                 pos += sizeof(*sec_chan_ie);
1519 
1520                 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1521         }
1522 
1523         /* just set the values to 0, this is a template */
1524         iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1525 
1526         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1527                                               WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1528                                               0, 0, !sta->sta.tdls_initiator,
1529                                               extra_ies, extra_ies_len,
1530                                               oper_class, chandef);
1531         if (!skb)
1532                 return NULL;
1533 
1534         skb = ieee80211_build_data_template(sdata, skb, 0);
1535         if (IS_ERR(skb)) {
1536                 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1537                 return NULL;
1538         }
1539 
1540         if (ch_sw_tm_ie_offset) {
1541                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1542 
1543                 if (!tm_ie) {
1544                         tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1545                         dev_kfree_skb_any(skb);
1546                         return NULL;
1547                 }
1548 
1549                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1550         }
1551 
1552         tdls_dbg(sdata,
1553                  "TDLS channel switch request template for %pM ch %d width %d\n",
1554                  sta->sta.addr, chandef->chan->center_freq, chandef->width);
1555         return skb;
1556 }
1557 
1558 int
1559 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1560                               const u8 *addr, u8 oper_class,
1561                               struct cfg80211_chan_def *chandef)
1562 {
1563         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1564         struct ieee80211_local *local = sdata->local;
1565         struct sta_info *sta;
1566         struct sk_buff *skb = NULL;
1567         u32 ch_sw_tm_ie;
1568         int ret;
1569 
1570         mutex_lock(&local->sta_mtx);
1571         sta = sta_info_get(sdata, addr);
1572         if (!sta) {
1573                 tdls_dbg(sdata,
1574                          "Invalid TDLS peer %pM for channel switch request\n",
1575                          addr);
1576                 ret = -ENOENT;
1577                 goto out;
1578         }
1579 
1580         if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1581                 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1582                          addr);
1583                 ret = -ENOTSUPP;
1584                 goto out;
1585         }
1586 
1587         skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1588                                             &ch_sw_tm_ie);
1589         if (!skb) {
1590                 ret = -ENOENT;
1591                 goto out;
1592         }
1593 
1594         ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1595                                       chandef, skb, ch_sw_tm_ie);
1596         if (!ret)
1597                 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1598 
1599 out:
1600         mutex_unlock(&local->sta_mtx);
1601         dev_kfree_skb_any(skb);
1602         return ret;
1603 }
1604 
1605 void
1606 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1607                                      struct net_device *dev,
1608                                      const u8 *addr)
1609 {
1610         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1611         struct ieee80211_local *local = sdata->local;
1612         struct sta_info *sta;
1613 
1614         mutex_lock(&local->sta_mtx);
1615         sta = sta_info_get(sdata, addr);
1616         if (!sta) {
1617                 tdls_dbg(sdata,
1618                          "Invalid TDLS peer %pM for channel switch cancel\n",
1619                          addr);
1620                 goto out;
1621         }
1622 
1623         if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1624                 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1625                          addr);
1626                 goto out;
1627         }
1628 
1629         drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1630         clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1631 
1632 out:
1633         mutex_unlock(&local->sta_mtx);
1634 }
1635 
1636 static struct sk_buff *
1637 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1638                                    u32 *ch_sw_tm_ie_offset)
1639 {
1640         struct ieee80211_sub_if_data *sdata = sta->sdata;
1641         struct sk_buff *skb;
1642         u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1643 
1644         /* initial timing are always zero in the template */
1645         iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1646 
1647         skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1648                                         WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1649                                         0, 0, !sta->sta.tdls_initiator,
1650                                         extra_ies, sizeof(extra_ies), 0, NULL);
1651         if (!skb)
1652                 return NULL;
1653 
1654         skb = ieee80211_build_data_template(sdata, skb, 0);
1655         if (IS_ERR(skb)) {
1656                 tdls_dbg(sdata,
1657                          "Failed building TDLS channel switch resp frame\n");
1658                 return NULL;
1659         }
1660 
1661         if (ch_sw_tm_ie_offset) {
1662                 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1663 
1664                 if (!tm_ie) {
1665                         tdls_dbg(sdata,
1666                                  "No switch timing IE in TDLS switch resp\n");
1667                         dev_kfree_skb_any(skb);
1668                         return NULL;
1669                 }
1670 
1671                 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1672         }
1673 
1674         tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1675                  sta->sta.addr);
1676         return skb;
1677 }
1678 
1679 static int
1680 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1681                                            struct sk_buff *skb)
1682 {
1683         struct ieee80211_local *local = sdata->local;
1684         struct ieee802_11_elems elems;
1685         struct sta_info *sta;
1686         struct ieee80211_tdls_data *tf = (void *)skb->data;
1687         bool local_initiator;
1688         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1689         int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1690         struct ieee80211_tdls_ch_sw_params params = {};
1691         int ret;
1692 
1693         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1694         params.timestamp = rx_status->device_timestamp;
1695 
1696         if (skb->len < baselen) {
1697                 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1698                          skb->len);
1699                 return -EINVAL;
1700         }
1701 
1702         mutex_lock(&local->sta_mtx);
1703         sta = sta_info_get(sdata, tf->sa);
1704         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1705                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1706                          tf->sa);
1707                 ret = -EINVAL;
1708                 goto out;
1709         }
1710 
1711         params.sta = &sta->sta;
1712         params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1713         if (params.status != 0) {
1714                 ret = 0;
1715                 goto call_drv;
1716         }
1717 
1718         ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1719                                skb->len - baselen, false, &elems,
1720                                NULL, NULL);
1721         if (elems.parse_error) {
1722                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1723                 ret = -EINVAL;
1724                 goto out;
1725         }
1726 
1727         if (!elems.ch_sw_timing || !elems.lnk_id) {
1728                 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1729                 ret = -EINVAL;
1730                 goto out;
1731         }
1732 
1733         /* validate the initiator is set correctly */
1734         local_initiator =
1735                 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1736         if (local_initiator == sta->sta.tdls_initiator) {
1737                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1738                 ret = -EINVAL;
1739                 goto out;
1740         }
1741 
1742         params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1743         params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1744 
1745         params.tmpl_skb =
1746                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1747         if (!params.tmpl_skb) {
1748                 ret = -ENOENT;
1749                 goto out;
1750         }
1751 
1752         ret = 0;
1753 call_drv:
1754         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1755 
1756         tdls_dbg(sdata,
1757                  "TDLS channel switch response received from %pM status %d\n",
1758                  tf->sa, params.status);
1759 
1760 out:
1761         mutex_unlock(&local->sta_mtx);
1762         dev_kfree_skb_any(params.tmpl_skb);
1763         return ret;
1764 }
1765 
1766 static int
1767 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1768                                           struct sk_buff *skb)
1769 {
1770         struct ieee80211_local *local = sdata->local;
1771         struct ieee802_11_elems elems;
1772         struct cfg80211_chan_def chandef;
1773         struct ieee80211_channel *chan;
1774         enum nl80211_channel_type chan_type;
1775         int freq;
1776         u8 target_channel, oper_class;
1777         bool local_initiator;
1778         struct sta_info *sta;
1779         enum nl80211_band band;
1780         struct ieee80211_tdls_data *tf = (void *)skb->data;
1781         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1782         int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1783         struct ieee80211_tdls_ch_sw_params params = {};
1784         int ret = 0;
1785 
1786         params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1787         params.timestamp = rx_status->device_timestamp;
1788 
1789         if (skb->len < baselen) {
1790                 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1791                          skb->len);
1792                 return -EINVAL;
1793         }
1794 
1795         target_channel = tf->u.chan_switch_req.target_channel;
1796         oper_class = tf->u.chan_switch_req.oper_class;
1797 
1798         /*
1799          * We can't easily infer the channel band. The operating class is
1800          * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1801          * solution here is to treat channels with number >14 as 5GHz ones,
1802          * and specifically check for the (oper_class, channel) combinations
1803          * where this doesn't hold. These are thankfully unique according to
1804          * IEEE802.11-2012.
1805          * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1806          * valid here.
1807          */
1808         if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1809              oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1810              target_channel < 14)
1811                 band = NL80211_BAND_5GHZ;
1812         else
1813                 band = target_channel < 14 ? NL80211_BAND_2GHZ :
1814                                              NL80211_BAND_5GHZ;
1815 
1816         freq = ieee80211_channel_to_frequency(target_channel, band);
1817         if (freq == 0) {
1818                 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1819                          target_channel);
1820                 return -EINVAL;
1821         }
1822 
1823         chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1824         if (!chan) {
1825                 tdls_dbg(sdata,
1826                          "Unsupported channel for TDLS chan switch: %d\n",
1827                          target_channel);
1828                 return -EINVAL;
1829         }
1830 
1831         ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1832                                skb->len - baselen, false, &elems, NULL, NULL);
1833         if (elems.parse_error) {
1834                 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1835                 return -EINVAL;
1836         }
1837 
1838         if (!elems.ch_sw_timing || !elems.lnk_id) {
1839                 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1840                 return -EINVAL;
1841         }
1842 
1843         if (!elems.sec_chan_offs) {
1844                 chan_type = NL80211_CHAN_HT20;
1845         } else {
1846                 switch (elems.sec_chan_offs->sec_chan_offs) {
1847                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1848                         chan_type = NL80211_CHAN_HT40PLUS;
1849                         break;
1850                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1851                         chan_type = NL80211_CHAN_HT40MINUS;
1852                         break;
1853                 default:
1854                         chan_type = NL80211_CHAN_HT20;
1855                         break;
1856                 }
1857         }
1858 
1859         cfg80211_chandef_create(&chandef, chan, chan_type);
1860 
1861         /* we will be active on the TDLS link */
1862         if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1863                                            sdata->wdev.iftype)) {
1864                 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1865                 return -EINVAL;
1866         }
1867 
1868         mutex_lock(&local->sta_mtx);
1869         sta = sta_info_get(sdata, tf->sa);
1870         if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1871                 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1872                          tf->sa);
1873                 ret = -EINVAL;
1874                 goto out;
1875         }
1876 
1877         params.sta = &sta->sta;
1878 
1879         /* validate the initiator is set correctly */
1880         local_initiator =
1881                 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1882         if (local_initiator == sta->sta.tdls_initiator) {
1883                 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1884                 ret = -EINVAL;
1885                 goto out;
1886         }
1887 
1888         /* peer should have known better */
1889         if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs &&
1890             elems.sec_chan_offs->sec_chan_offs) {
1891                 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1892                 ret = -ENOTSUPP;
1893                 goto out;
1894         }
1895 
1896         params.chandef = &chandef;
1897         params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1898         params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1899 
1900         params.tmpl_skb =
1901                 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1902                                                    &params.ch_sw_tm_ie);
1903         if (!params.tmpl_skb) {
1904                 ret = -ENOENT;
1905                 goto out;
1906         }
1907 
1908         drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1909 
1910         tdls_dbg(sdata,
1911                  "TDLS ch switch request received from %pM ch %d width %d\n",
1912                  tf->sa, params.chandef->chan->center_freq,
1913                  params.chandef->width);
1914 out:
1915         mutex_unlock(&local->sta_mtx);
1916         dev_kfree_skb_any(params.tmpl_skb);
1917         return ret;
1918 }
1919 
1920 static void
1921 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1922                                       struct sk_buff *skb)
1923 {
1924         struct ieee80211_tdls_data *tf = (void *)skb->data;
1925         struct wiphy *wiphy = sdata->local->hw.wiphy;
1926 
1927         ASSERT_RTNL();
1928 
1929         /* make sure the driver supports it */
1930         if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1931                 return;
1932 
1933         /* we want to access the entire packet */
1934         if (skb_linearize(skb))
1935                 return;
1936         /*
1937          * The packet/size was already validated by mac80211 Rx path, only look
1938          * at the action type.
1939          */
1940         switch (tf->action_code) {
1941         case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1942                 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1943                 break;
1944         case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1945                 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1946                 break;
1947         default:
1948                 WARN_ON_ONCE(1);
1949                 return;
1950         }
1951 }
1952 
1953 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1954 {
1955         struct sta_info *sta;
1956         u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1957 
1958         rcu_read_lock();
1959         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1960                 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1961                     !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1962                         continue;
1963 
1964                 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1965                                             NL80211_TDLS_TEARDOWN, reason,
1966                                             GFP_ATOMIC);
1967         }
1968         rcu_read_unlock();
1969 }
1970 
1971 void ieee80211_tdls_chsw_work(struct work_struct *wk)
1972 {
1973         struct ieee80211_local *local =
1974                 container_of(wk, struct ieee80211_local, tdls_chsw_work);
1975         struct ieee80211_sub_if_data *sdata;
1976         struct sk_buff *skb;
1977         struct ieee80211_tdls_data *tf;
1978 
1979         rtnl_lock();
1980         while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) {
1981                 tf = (struct ieee80211_tdls_data *)skb->data;
1982                 list_for_each_entry(sdata, &local->interfaces, list) {
1983                         if (!ieee80211_sdata_running(sdata) ||
1984                             sdata->vif.type != NL80211_IFTYPE_STATION ||
1985                             !ether_addr_equal(tf->da, sdata->vif.addr))
1986                                 continue;
1987 
1988                         ieee80211_process_tdls_channel_switch(sdata, skb);
1989                         break;
1990                 }
1991 
1992                 kfree_skb(skb);
1993         }
1994         rtnl_unlock();
1995 }
1996 
1997 void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata,
1998                                       const u8 *peer, u16 reason)
1999 {
2000         struct ieee80211_sta *sta;
2001 
2002         rcu_read_lock();
2003         sta = ieee80211_find_sta(&sdata->vif, peer);
2004         if (!sta || !sta->tdls) {
2005                 rcu_read_unlock();
2006                 return;
2007         }
2008         rcu_read_unlock();
2009 
2010         tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n",
2011                  peer, reason,
2012                  ieee80211_get_reason_code_string(reason));
2013 
2014         ieee80211_tdls_oper_request(&sdata->vif, peer,
2015                                     NL80211_TDLS_TEARDOWN,
2016                                     WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE,
2017                                     GFP_ATOMIC);
2018 }
/* [<][>][^][v][top][bottom][index][help] */
root/net/mac80211/tdls.c

DEFINITIONS
